Positive valve control for internal combustion engines



Nov. 28, 1933. w N 1,937,152

POSITIVE VALVE CONTROL FOR INTERNAL COMBUSTION ENGINES Filed Dec. 19,1931- Patented Nov. 28, 1933 UNITED STATES VALVE CONTROL FOR INTERNALCOMBUSTION ENGINES POSITIVE Walter Jiink, Berlin, Germany ApplicationDecember 19, 1931, Serial No. f

582,058 and in Germany December 23, 1930 1 Claim. (01. 74- -1) Theinvention relates to a positive valve control for internal combustionengines, in which the control is effected by slidable elements,yieldably mounted and gripping fork-like over the hollow cam disc.

In comparison with forms of construction providing a subdivision of thevalve shaft and its yieldable connection with the cam disc, the valvecontrol according to the invention is distinguished by the fact that allgear elements outside the valve shaft and mounted independently of thisshaft are omitted and that the'removing of the valve, on which theadditional elements forming a unit with the valve shaft are mounted canbe carried out in the simplest manner.

The characteristic feature of the invention consists therefore chieflyin that the valve shaft, subdivided into two mutually adjustable parts,terminates in a fork, the upper part of which bears directly against thecam disc like a slidable shoe, whereas the lower part accommodates aslit piston and a transverse pin, serving as abutment for a spring whichpresses the piston against the inner side of the cam.

An embodiment of the invention is diagrammatically illustrated by way ofexample in the accompanying drawing, in which:--

Fig. 1 shows the control arrangement in longitudinal section and in theposition in which the cam has just closed the valve.

Fig. 2 is a side elevation partly in section, showing the valve inclosed position.

Fig. 3 shows the yieldable piston in elevation, partly in section.

Fig. 4 shows in plan View from below the bifurcated part carrying thepiston.

' The valve shaft consists of an upper or outer part a and or" a loweror inner part b, the end of which forms a pusher. The lower part b hasan internally threaded bore screwed on to the screw threaded end of theupper part a. The two parts of the valve shaft can be shifted the onewith regard to the other by means of a wrench to be placed for instanceon a square portion 12 of the valve shaft 0.. On the valve shaft alocking nut e is screwed, designed to secure the two parts in theiradjusted position. The pusher hollow space n of piston I, one end ofsaid spring bearing against a piston p of the collar and the other endagainst a transverse pin q. This transverse pin 'q is inserted through abore 1 in the pusher shoe h and secured in position by means of a splintor in any other suitable manner.

A transverse wedge s, bearing into the pusher shoe h serves to limit theupward movement of the piston Z controlled by the tension of the spring0. The hollow cam disc 1' is keyedj on the cam shaft t and works withboth sides.

The operation of the device is as follows:.

The valve a is lifted by the cam portion 2" of I cam disc 2' cooperatingwith the pressure shoe 9, which might also consist of a roller. If thelifting: of the valve a. is completed (Fig. 1) and the, cam portion 1"is on theother side of the upper pusher shoe 9, the piston Z rolling onthe inner side of the beaded edge 1' is pressed, in opposition to theaction ofspring o, in the direction of the arrow in Fig. 1, the valve abeing thereby closed. For the collar p of the piston Z a roller might besubstituted. a

The transverse pin q, forming an abutment for the spring 0, ensuresthatthe collar p of the piston, bearing with its entire surface againstthe inner side of the beaded rim 2', preserves its position. The spring0 (Fig. 3) is especially provided to ensure a tight closing of the valverelative to the cylinder space, even if the motor is hot.

The transverse pin q, as already mentioned,

forms an abutment for one end of the spring,

ton adapted to guide said piston in. said lower arm, and a springbetween said pin and said piston adapted.- to resiliently hold saidpiston in contact with said cam. I n

WALTER 1 the lower portion, the bifurcated end 1 being placed over thebeaded edge i of the cam disc k. The lower pressure shoe h has a bore 1'for a yieldable movable piston l, which is hollow and has a verticalslot m. A spiral spring 0 is located in the the lower f

